Design of Machi...

For a plate with an elliptical hole subjected to tensile stress, σ as shown in the figure, the maximum tensile stress at point P is

Two plates are joined together by means of single transverse and double parallel fillet welds as shown in figure given above. If the size of fillet is 5 mm and allowable shear load per mm is 300 N, what is the approximate length of each parallel fillet?

A ball bearing is anticipated to have a life of 400 M. Rev (Mega Revolutions) under an equivalent load of 10 kN, with reliability of 90%.  Now,

A natural feed journal bearing of diameter 50 mm and length 50 mm operating at 20 revolution/second carries a load of 2.0 kN. The lubricant used has a viscosity of 20 mPa s. The radial clearance is 50 μm. The Sommerfield number for the bearing is

A circular rod of diameter d is welded to a flat plate along its circumference by fillet weld of thickness t. Assuming τw as the allowable shear stress for the weld material, what is the value of the safe torque that can be transmitted?

In the multiple disc clutch, if there are 6 discs on the driving shaft and 5 discs on the driven shaft, then the number of pairs of contact surfaces will be equal to

A belt having dimensions 25cm × 1.25cm has the ratio of tension 2 and maximum permissible tension is 150 N/cm². The weight of belt material is 1400 N/m. The maximum power that can be transmitted (in kW) is

A rectangular key of 14mm width, 8 mm height and a shaft of 30 mm diameter made up of same material. If the stress concentration is neglected, then the necessary length of the key for the equal shear strength of shaft and key (in mm), will be__

A circular solid rod of diameter d welded to a rigid flat plate by a circular fillet weld of throat thickness t is subjected to a twisting moment T. The maximum shear stress induced in the weld is

The permissible stress in a filled weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on weldment per cm length of the weld is

A rotating beam test specimen is subjected to alternating stress between 100 MPa and -130 MPa. Then which of the following statements are true?

A key connecting a flange coupling to a shaft is likely to fail in

A 4 meter long solid circular cylindrical shaft transmits 1600 kW at 500 rpm. The endurance limit of the material is 210 MPa and a factor of safety of 3 is to be used with respect to fatigue failure. Use G = 77.5 GPa. The design diameter ‘D’ of the shaft in metre is

Radial load acting on a ball bearing is 2500 N for the first five revolutions and reduces to 1500 N for the next ten revolutions. The load variations then repeat itself. The expected life of the bearing is 20 million revolutions. The dynamic load capacity of the bearing is _________ N.

In the assembly of pulley, key and shaft

A rectangular steel plate is joined to a vertical post using four identical rivets arranged as shown below in the figure. The shear load on the worst loaded rivet (in N) approximately is

The ratio of the diameter of rivet hole to the pitch of the rivet is 0.25, then the tearing efficiency of the joint is

Which one of the following statements is correct?

While designing a parallel sunk key it is assumed that the distribution of force along the length of the key

A single parallel fillet weld of total length L and weld size h subjected to a tensile load P, will have what design stress?

A clutch has outer and inner radius of 50 mm and 20 mm respectively. The pressure at inner radius is 2 MPa and coefficient of friction is 0.4. Assuming uniform wear theory, which of the following statements are true?

A shaft of diameter D is subjected to a fluctuating torque of 200 Nm to 600 Nm. By assuming factor of safety (FOS) = 2.5, S_yt = 200 MPa, S_ut = 400 MPa, K_t = 2, q = 0.8, which of the following statements are true?

The bolts in a rigid flanged coupling connecting two shafts transmitting power are subjected to

A disk clutch is required to transmit 5 kW at 2000 rpm. The disk has a friction lining with coefficient of friction equal to 0.25. Bore radius of friction lining is equal to 25 mm. Assume uniform contact pressure of 1 MPa. The value of outside radius of the friction lining is

The ratio of tension on the tight side to that on the slack side in a flat belt drive is

A spur gear has a module of 3mm, number of teeth 16, a face width of 36 mm and a pressure angle of 20°. It is transmitting a power of 3kW at 20rev/s. taking a velocity factor of 1.5 and a form factor of 0.3, the stress in the gear is about